2 problems after installation

[Luca Brandi]

Hi,
today i installed the app and got 2 problems.
1. list filters do not work (button is there but no aciton)
2, On the original django admin I creates some tabular models and succeded in resizing fields width  using this functoin:
formfield_overrides = {
        models.CharField: {'widget': TextInput(attrs={'size':'5'})},
        models.TextField: {'widget': Textarea(attrs={'rows':1, 'cols':30})},
        models.DecimalField: {'widget': TextInput(attrs={'size':'5'})},
    }

Unfortunately with Grappelli function doesnt work and fields have a huge width.
Any idea? thanks